In the following diagram, the green ball changes direction after colliding with the red ball because the red ball has more momentum.
True
False***?
2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s.
4.00 kg m/s
20.0 kg m/s
25.0 kg m/s
100 kg m/s***
3. Which of the following describes the relationship between friction and inertia?
When there is more friction, there is less inertia
When there is less friction, there is more inertia
When there is more friction, there is more inertia***
When there is no friction,there is more inertia
4. Jellyfish sometimes squeeze in the sides of their bodies. This pushes a stream of water from the back end of their bodies. According to Newton's third law of motion, how will this behavior affect the movement of the jellyish?
The jellyfish will move forward***
The inertia of the jellyfish will increase***?
the Jellyfish will move backward
The jellyfish will stay still.
5. Which of the following would have less momentum than a 52 kg cheetah at 10 m/s
a 71 kg lion running at 10 m/s
a 45 kg zebra running at 13 m/s***
a 5,000 kg elephant walking at 1 m/s
a 61 kg zebra running at 8.0 m/s
6. According to Newton's third law of motion, if a rolling ball collides with a wall and exerts a force of 3N on that wall, how much force does the wall excert back on the ball.
0 N
3 N***
6 N
9 N
7. After an avalanche, a huge block of stone slid down a mountain and landed in the middle of a road. People in the nearby town had a very difficult time moving it out of the road. The block of stone is difficult to move because
it has a high amount of momentum
has balanced forces acting on it***
it has a high amount of inertia
has unbalanced forces acting on it***?
8. Which of the following statements is true about a collison between two cars?
The total momentum after the collision is the same as the total momentum befor the collision
The total momentum after the collision is greater than the total momentum beforethe collision***?
The total momentum after the collision is less than the total momentum before the collision***
The total momentum after the collision is zero.
a few of them i know im right, but the rest im on edge, all of them i feel are on par with another one...
pls help asap!
thanx in advance (feels good to be saying that again)
i agree except with numbers 2 4 7
actually, 2 is correct cuz it was for a quick check and it was 100 kg...
4. ??? is it one of my options i chose?
7. ??? if its not the ones i had an option for i think its c?
the answer that is correct such as 8. is the one that doesnt have the ? after the ***
i agree with al of them but 3 and 7
Let's go through each question and check your answers:
1. The green ball changes direction after colliding with the red ball because the red ball has more momentum.
False. The change in direction after a collision is determined by the forces and angles involved, not just the momentum. Therefore, this statement is false.
2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s?
To find the momentum, you multiply the mass (20.0 kg) by the velocity (5.00 m/s). So the momentum is 20.0 kg * 5.00 m/s = 100 kg m/s.
The correct answer is 100 kg m/s.
3. Which of the following describes the relationship between friction and inertia?
When there is more friction, there is more inertia.
This statement is incorrect. Inertia is the resistance of an object to changes in its motion. Friction opposes motion, and when there is more friction, there is less inertia.
4. Jellyfish sometimes squeeze in the sides of their bodies, pushing a stream of water from the back end. According to Newton's third law of motion, how will this behavior affect the movement of the jellyfish?
The jellyfish will move forward.
This statement is correct. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. So when the jellyfish pushes the water backward, an equal and opposite force propels the jellyfish forward.
5. Which of the following would have less momentum than a 52 kg cheetah at 10 m/s?
A 45 kg zebra running at 13 m/s.
To find momentum, you multiply mass by velocity. The momentum of the cheetah is 52 kg * 10 m/s = 520 kg m/s. For the zebra, it would be 45 kg * 13 m/s = 585 kg m/s, which is greater than the cheetah's momentum. Therefore, the correct answer is a 45 kg zebra running at 13 m/s.
6. According to Newton's third law of motion, if a rolling ball collides with a wall and exerts a force of 3N on that wall, how much force does the wall exert back on the ball?
The wall exerts 3N of force back on the ball.
According to Newton's third law of motion, the force exerted by the ball on the wall is equal and opposite to the force exerted by the wall on the ball. Therefore, the correct answer is 3N.
7. After an avalanche, a huge block of stone slid down a mountain and landed on a road. The block is difficult to move because it has balanced forces acting on it.
This statement is incorrect. The block of stone is difficult to move because it has a high amount of inertia. Inertia is the resistance of an object to changes in its motion, and a large block of stone would have a high amount of inertia.
8. Which of the following statements is true about a collision between two cars?
The total momentum after the collision is the same as the total momentum before the collision.
This statement is incorrect. In most cases, during a collision between two cars, some momentum is transferred to the surroundings (such as the deformation of the cars or the ground). As a result, the total momentum after the collision is usually less than the total momentum before the collision.
Reviewing your answers:
1. False (Correct)
2. 100 kg m/s (Correct)
3. When there is more friction, there is more inertia (Incorrect)
4. The jellyfish will move forward (Correct)
5. A 45 kg zebra running at 13 m/s (Correct)
6. 3 N (Correct)
7. It has balanced forces acting on it (Incorrect)
8. The total momentum after the collision is less than the total momentum before the collision (Incorrect)
I hope this clears things up! If you have any more questions, feel free to ask.